Copper(I)-catalyzed coupling reaction between phenylmagnesium bromide and 3,3,3-trifluoropropene

Abstract

brucination cycle applied to the +90.2°material gave 900 mg of volatiles (a^+68.9°) and from the brucine 340 mg (am +122.1°) of volatiles. A gas chromatographic analysis of this last fraction gave 95.3% 2,3-dibromobutane, 2.5% 2-bromo-2-butene, 0.6% diethyl ether, and 1.5% CFC13. Differential scanning calorimetry applied to this best fraction indicated the dextrorotatory component was 70% of this mixture, the remainder being d,l and the other listed contaminants.Registry No. (fi*,f?*)-(±)-2,3-Dibromobutane, 598-71-0; brucine, 357-57-3; 2-bromo-2-butene, 13294-71-8; (S,S)-(-)-2,3dibromobutane, 49623-63-4; (R,f?)-(+)-2,3-dibromobutane, 58560-19-3.

Azido-1,2,3-triphenylpropenes of Varying Stabilities: A Corrigendum of Structure Assignment

“…21. In the case of compounds of type 30 with X ϶ H, the influence of X and the phenyl group at C-1 on the chemical shift of the 3-H signal is not as straightforward as might appear considering the compounds in Table 1. Thus, the configurations of compounds 30 cannot easily be correlated with the δ values of 3-H, as shown, for example, by considering the data for 30a with X ϭ Me, [46] X ϭ F, [47] X ϭ Scheme 6. NOE enhancements observed for the 1 H NMR signals Cl, [48] and X ϭ Br [49] or 30b with X ϭ Me, [50] X ϭ Bu, [9] of (E)-3 and results derived from 1 H NMR spectra of 4t and 26t X ϭ CH 2 Ph, [51] and X ϭ Cl.…”